Structure and thermoelastic martensitic transformations in ternary Ni–Ti–Hf alloys with a high-temperature shape memory effect
- Authors: Pushin V.G.1,2, Kuranova N.N.1, Pushin A.V.1,2, Uksusnikov A.N.1, Kourov N.I.1
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Affiliations:
- Institute of Metal Physics, Ural Branch
- Ural Federal University
- Issue: Vol 61, No 7 (2016)
- Pages: 1009-1014
- Section: Solid State
- URL: https://journals.rcsi.science/1063-7842/article/view/197512
- DOI: https://doi.org/10.1134/S1063784216070203
- ID: 197512
Cite item
Abstract
The effect of alloying by 12–20 at % Hf on the structure, the phase composition, and the thermoelastic martensitic transformations in ternary alloys of the quasi-binary NiTi–NiHf section is studied by transmission electron microscopy, scanning electron microscopy, electron diffraction, and X-ray diffraction. The electrical resistivity is measured at various temperatures to determine the critical transformation temperatures. The data on phase composition are used to plot a full diagram for the high-temperature thermoelastic B2 ↔ B19’ martensitic transformations, which occur in the temperature range 320–600 K when the hafnium content increases from 12 to 20 at %. The lattice parameters of the B2 and B19’ phases are measured, and the microstructure of the B19’ martensite is analyzed.
About the authors
V. G. Pushin
Institute of Metal Physics, Ural Branch; Ural Federal University
Author for correspondence.
Email: pushin@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Yekaterinburg, 620990; ul. Mira 19, Yekaterinburg, 620002
N. N. Kuranova
Institute of Metal Physics, Ural Branch
Email: pushin@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Yekaterinburg, 620990
A. V. Pushin
Institute of Metal Physics, Ural Branch; Ural Federal University
Email: pushin@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Yekaterinburg, 620990; ul. Mira 19, Yekaterinburg, 620002
A. N. Uksusnikov
Institute of Metal Physics, Ural Branch
Email: pushin@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Yekaterinburg, 620990
N. I. Kourov
Institute of Metal Physics, Ural Branch
Email: pushin@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Yekaterinburg, 620990